YARN-967. Added the client and CLI interfaces for obtaining ApplicationHistory data. Contributed by Mayank Bansal.
svn merge --ignore-ancestry -c 1556747  ../YARN-321


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1562202 13f79535-47bb-0310-9956-ffa450edef68